Smart Calculator - All-in-One

All-in-one calculator for everyday math, school, work and money: a scientific calculator, fraction calculator, unit converter, currency converter and 24 quick calculators in one free calculator app. No account needed.

Calculate, convert and solve in seconds, from simple sums to equations, graphs, loans, percentages and GPA. Most tools work offline.

➕ Everyday Calculator
• Add, subtract, multiply and divide with the correct order of operations
• Percentages, parentheses, powers, square and factorial
• Memory keys (M+, M−, MR, MC), undo and backspace
• Live result preview as you type
• Choose 0 to 10 decimal places; very large numbers in scientific notation

🔬 Scientific Calculator
• sin, cos, tan with inverse and hyperbolic functions
• log, ln, square root, cube root, absolute value
• π, e and the golden ratio
• Degrees (DEG) and radians (RAD)

🔢 Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers. See each answer as a mixed number, a fraction or a decimal.

📷 Math Scanner – Camera Calculator
Point your camera at a printed or neatly handwritten calculation and get the answer. Text is recognized on your device – nothing is uploaded. You can correct the expression before calculating.

🧮 Equation Solver & Graphing Calculator
• Quadratic equation solver (ax² + bx + c = 0), including complex roots
• Systems of linear equations with 2 or 3 unknowns
• Matrix calculator (2×2 and 3×3): add, subtract, multiply, determinant, inverse
• Graphing calculator: plot up to three functions; pinch to zoom, tap to read values

💻 Programmer Calculator
Binary, octal, decimal and hexadecimal converter. Use AND, OR, XOR, NOT, NAND, NOR, XNOR and bit shifts with 8, 16, 32 or 64-bit word sizes and two's complement.

💰 Finance Calculators
• Loan, mortgage and EMI calculator: monthly payment, total payment, total interest
• Compound interest and savings calculator, compounded yearly, monthly or daily
• Discount calculator, with a second discount
• Tip calculator and bill splitter
• VAT, GST and sales tax calculator: add tax to a price or take it out
• Percentage calculator: percent of, percent change, increase, decrease, price after discount, price with tax

🔄 Unit Converter
Length, weight, volume, temperature, area, speed, time, energy, power, pressure, force and data storage – km to miles, kg to lbs, Celsius to Fahrenheit, cm to inches, GB to MB and more.

💱 Currency Converter
Live exchange rates for world currencies such as USD, EUR, GBP, JPY and VND, with quick search. The latest rates stay available offline.

🧰 Everyday Tools
• Age calculator with next birthday countdown and the weekday you were born
• Date difference calculator: days, weeks, months and years between dates
• GPA calculator (4-point or 10-point scale)
• World clock: add any city
• Fuel cost and gas mileage calculator (L/100 km, km/L, MPG)
• Clothing, shoe and ring size converter (US, UK, EU)
• BMI calculator and daily calorie calculator (BMR)
Search every tool and pin your favorites to the top.

🇻🇳 Vietnam Tools
• Gross ↔ net salary calculator with personal income tax, social insurance and dependents
• Write amounts in Vietnamese words for invoices and receipts
• Lunar ↔ solar calendar converter with leap months and the year's name

🕘 Calculation History
Every calculation is saved. Copy the result or the expression, share, edit and reuse it, or lock the ones you want to keep.

🎨 Themes & Widgets
• 13 themes, including dark themes and Material You on Android 12+
• 24 wallpapers, or use your own photo
• Customize key colors, the display, corners, key style and font
• Resizable home-screen calculator widgets: basic, scientific and fraction, in the app theme or one you choose
• Keep the screen on while you calculate

Great for students, teachers, engineers, shoppers, travelers and small businesses: homework, exams, budgets, invoices and trips.

One free calculator app for math, finance, study and everyday life.

Recent changes:
Welcome to All-in-One Calculator 1.0!
• Basic, scientific and fraction calculator with history
• Unit and live currency converter
• 24 quick tools: loan, VAT, discount, tip, BMI, GPA, age, date difference, world time, lunar calendar, matrix, graph and more
• Scan a sum with your camera, read on-device
• 13 themes, Material You and photo wallpapers
• Home-screen widgets: basic, scientific, fraction
• 20 languages, decimal places setting, keep screen on